That sounds like a first rate method and I'll try it to compare. I just warm up a shotmaker with a shallow layer of lead. The lead too is not too hot. When moulten, the case goes in mouth first up to the shoulder. It can't go deeper as the lead layer is only shallow anyway. 5 seconds then quench. The first lot I did was a batch where every unfired case split just being F.L. sized. So I annealed them. I followed the instructions which said primer out. Clearly a live primer is a no-no, but with no primer at all, air bled from the exposed flash hole and a drop of lead got into several cases and solidified. These were really expensive cases. Now that they were annealed, I was able to expand their neck up in several steps, use a bullet puller to remove the lead and then neck them back down again. Not a single split neck and, none split after being fired and reloaded several times either. I guess this brass (5,6x61 S.E. vom Hofe) was old stock.

The thing I take from all this is (1) always leave a spent primer in the case if using this method, (never a live one). And (2) annealing REALLY works.